//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\
//                                                                        \\
//                 Centre for Speech Technology Research                  \\
//                      University of Edinburgh, UK                       \\
//                        Copyright (c) 1996,1997                         \\
//                         All Rights Reserved.                           \\
//   Permission is hereby granted, free of charge, to use and distribute  \\
//   this software and its documentation without restriction, including   \\
//   without limitation the rights to use, copy, modify, merge, publish,  \\
//   distribute, sublicense, and/or sell copies of this work, and to      \\
//   permit persons to whom this work is furnished to do so, subject to   \\
//   the following conditions:                                            \\
//    1. The code must retain the above copyright notice, this list of    \\
//       conditions and the following disclaimer.                         \\
//    2. Any modifications must be clearly marked as such.                \\
//    3. Original authors' names are not deleted.                         \\
//    4. The authors' names are not used to endorse or promote products   \\
//       derived from this software without specific prior written        \\
//       permission.                                                      \\
//   THE UNIVERSITY OF EDINBURGH AND THE CONTRIBUTORS TO THIS WORK        \\
//   DISCLAIM ALL WARRANTIES With REGARD TO THIS SOFTWARE, INCLUDING      \\
//   ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT   \\
//   SHALL THE UNIVERSITY OF EDINBURGH NOR THE CONTRIBUTORS BE LIABLE     \\
//   FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES    \\
//   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN   \\
//   AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,          \\
//   ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF       \\
//   THIS SOFTWARE.                                                       \\
//                                                                        \\
//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\
//                                                                        \\
//                  Author: Richard Caley (rjc@cstr.ed.ac.uk)             \\
//  --------------------------------------------------------------------  \\
//  A thread safe queue based on Vector. Could be faster.                 \\
//                                                                        \\
//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\//\\

package interactivespaces.service.speech.synthesis.internal.festival.client;

import java.util.Enumeration;
import java.util.Vector;

public class JobQueue {
  Vector q;

  public JobQueue(int space) {
    q = new Vector(space);
  }

  public JobQueue() {
    q = new Vector();
  }

  public synchronized void add(Object thing) {
    q.addElement(thing);
  }

  public synchronized void remove(Object thing) {
    q.removeElement(thing);
  }

  public synchronized boolean isEmpty() {
    return q.isEmpty();
  }

  public synchronized Object top() {
    Object o;

    if (q.isEmpty())
      o = null;
    else
      o = q.firstElement();
    return o;
  }

  public synchronized Object get() {
    Object o;

    if (q.isEmpty())
      o = null;
    else {
      o = q.firstElement();
      q.removeElementAt(0);
    }
    return o;
  }

  public synchronized Enumeration elements() {
    return q.elements();
  }
}
